Description Are you looking for a creative intelligence toy for your kids? This Newton's cradle model will be your best choice. This product is a DIY Newton's cradle model for students. It is excellent for learning energy balance and dynamics. It is a good gift for kids. Also a experiment and teaching model for classroom. Features - Color: Silver. - Material: Iron. - Size: 9x8.7x10.5cm/ 3.54x3.42x4.13 inch. - Made of premium material, durable and safe to use. - Greatly improve kids hands-on skills and children's imagination and operation ability. - Suitable for home and office decoration. - Also a experiment and teaching Newton's cradle model in class. - Excellent for learning energy balance and dynamics. - A nice gadget for kids, adults, etc.Package listing: 1 x swing ball toy